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22.5.10.22 The ndbinfo diskstats_1sec Table
The diskstats_1sec table provides information
about writes to Disk Data tablespaces over the past 20 seconds.
The following table provides information about the columns in
the diskstat table. For each column, the
table shows the name, data type, and a brief description.
Additional information can be found in the notes following the
table.
Table 22.313 Columns of the diskstat table
| Column Name | Type | Description |
|---|---|---|
node_id |
integer | Node ID of this node |
block_instance |
integer | ID of reporting instance of PGMAN |
pages_made_dirty |
integer | Pages made dirty during the designated 1-second interval |
reads_issued |
integer | Reads issued during the designated 1-second interval |
reads_completed |
integer | Reads completed during the designated 1-second interval |
writes_issued |
integer | Writes issued during the designated 1-second interval |
writes_completed |
integer | Writes completed during the designated 1-second interval |
log_writes_issued |
integer | Number of times a page write has required a log write during the designated 1-second interval |
log_writes_completed |
integer | Number of log writes completed during the designated 1-second interval |
get_page_calls_issued |
integer | Number of get_page() calls issued during the
designated 1-second interval |
get_page_reqs_issued |
integer | Number of times that a get_page() call has resulted
in a wait for I/O or completion of I/O already begun
during the designated 1-second interval |
get_page_reqs_completed |
integer | Number of get_page() calls waiting for I/O or I/O
completion that have completed during the designated
1-second interval |
seconds_ago |
integer | Number of 1-second intervals in the past of the interval to which this row applies |
Each row in this table corresponds to an instance of
PGMAN during a 1-second
interval occurring from 0 to 19 seconds ago; there is one such
instance per LDM thread plus an additional instance for each
data node.
The diskstats_1sec table was added in NDB
8.0.19.
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